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    • 16. 发明专利
    • System and method for determining engine torque for controlling a powertrain
    • GB2350163B
    • 2003-03-12
    • GB0010540
    • 2000-05-03
    • FORD GLOBAL TECH INC
    • ROBICHAUX JERRY DEANCLARK TIMOTHY JOSEPHPALLETT TOBIAS JOHN
    • B60K26/04B60W10/06B60W30/18F02D41/02F16H59/38B60K41/04
    • A system and method for controlling a powertrain including an automatic transmission include determining a desired wheel torque, determining engine speed, determining turbine speed, determining a selected gear and associated selected gear ratio, determining a transmission spin loss based on a first function of the turbine speed and the selected gear, determining a transmission torque proportional loss based on a second function of the turbine speed and the selected gear, determining a desired engine torque based on the transmission spin loss, the transmission torque proportional loss, and the selected gear ratio, and controlling the powertrain using the desired engine torque such that actual wheel torque approaches the desired wheel torque. A transmission pump loss may also be determined based on line pressure and engine speed. An alternative strategy determines engine torque using a power-based calculation if the vehicle speed is above a predetermined threshold, and a gear ratio based calculation if the vehicle speed does not exceed the predetermined threshold. Strategies for determination of the desired or requested engine torque during a gear shift or ratio change include a first strategy which determines an engine torque corresponding to the current gear ratio and the target gear ratio with the desired engine torque being interpolated between the two values. Turbine speed may be determined by an appropriate sensor or estimated. Alternatively, torque converter slip may be utilized with the slip value held constant for a predetermined time during the ratio change.